ISMR3000E35 3.5 Inch Low Voltage IC Airtight New Construction Housing is designed for insulated new construction applications. IC designation allows housing to be in direct contact with insulation. Below ceiling accessible. Takes up to a 7/8 inch ceiling thickness. Low voltage 12 volt electronic transformer included. One 35 watt, 12 volt GU5.3 MR16 bulb is required, but not included. Dimmable with a low voltage electronic dimmer. See attached manufacturer dimmer compatibility reference when using LED bulb option. Suitable for damp locations. UL listed. 3.75 inch ceiling cut out. 15.25 inch length x 8.25 inch width x 7.9 inch height. A complete fixture includes a housing and trim, sold separately.